Is it permissible for a citizen to purchase a gifted plot of land for his father at a symbolic price if the father is unable to afford it, with the land belonging to the buyer, while taking into account the rights of the siblings?

If the questioner's brothers do not own the price of the land or a part of it, there is no harm in them waiving the grant specifically for her. However, if one of them owns a part of the price, then he should share a portion of the land with the questioner commensurate with what he possesses, in consideration of fairness among the children.